Year	US Dollars, Sum Over Component Sub-periods
1998-01-01	400000000
1999-01-01	400000000
2000-01-01	500000000
2001-01-01	600000000
2002-01-01	800000000
2003-01-01	1000000000
2004-01-01	1400000000
2005-01-01	3900000000
2006-01-01	3500000000
2007-01-01	5500000000
2008-01-01	9400000000
2009-01-01	11000000000
2010-01-01	8800000000
2011-01-01	31000000000
2012-01-01	47700000000